my buddy has a MKS-70 that's a pretty sweet little beastie
http://www.bagger288.com/goldenmaster/?p=169
if you've got the PG-800 programmer you get some pretty wicked hands on control which is nice for prgramming patches
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Milwaukee, Wisconsin USA
i am not a fan of the Poly800... if my memory serves me correct it's not even analog.
as for the mono/poly. Love it . own one myself. :-D it's my flag ship for analog synths.
But i'm talking for buying brand new... hands down.. DSI is the best route.
DSI 
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DSI definitely the best to buy new. Mono/Poly for archetype analogue monster.
I have a Poly800 that's pretty nice, but it's very plastic sounding. The great thing about them is they are cheap (usually < $100) and very easily modified. With then $100 Hawk800 mod, you can take a $200 (total) quasi-analogue kitten and turn it into a synth comparable to a $1000 analogue beast (and then some).
PS: The Poly 800 is analogue, but it's a digitally controlled hybrid. Strange machine.
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Milwaukee, Wisconsin USA
last time i owned a poly800 i was like 16. lol. did the filter mods myself.